The previous owner had installed power windows, and this
top with a sunroof provision..
The snaps along the front are double snaps. On the back
side of the snap is the female snap that
attaches to the top frame, then the FRONT side becomes
the male portion that is used to
connect to the cover. The back and sides of the top cover
are velcro.

Note the velcro, the lining behind the top cover, and the
sun's effect where the weather had
beaten down on the top.

The top cover extends over the cross-bar of the top frame

The above picture is large so that you can see how
the stitching is done.
Bobbie, the owner reports that the top cover stays on
fine at highway speeds and does
not flap around!